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Dell PowerVault MD1000 SAS Solution Manual de usuario Pagina 2

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STORAGE
DELL POWER SOLUTIONS Re
p
rinted from Dell Power Solutions, August 2006. Copyright © 2006 Dell Inc. All rights reserve
d
.
A
ugust 200
6
2
store-and-forward switches that let a single SAS port address more
t
h
a
n
o
n
e
de
vi
ce.
A
SAS domain is
f
ormed b
y
a network o
f
SAS devices that are
i
nterconnected by SAS expanders. Any device in a SAS domain can
communicate wit
h
any ot
h
er
d
evice in t
h
e same SAS
d
omain. An
d
unlike SCSI, SAS enables bandwidth per
f
ormance to scale as more
d
evices are a
dd
e
d
to t
h
e
d
omain. Figure 1 provi
d
es a comparison
of SCSI and SAS capabilities
.
D
ell
S
A
S
im
p
lementatio
n
The Dell SAS im
p
lementation com
p
rises both hardware and so
f
t-
ware components. The hardware components consist of the Dell
P
owerVault MD1000 enclosure and the PCI Ex
p
ress–based PERC
5/E RAID controller. The software component consists of Dell
O
penMana
g
e Server Administrator so
f
tware.
D
e
ll
P
ower
V
au
l
t
MD
1000 externa
l
di
s
k
enc
l
osur
e
The Dell PowerVault MD1000 is the external SAS disk enclosure.
R
e
d
un
d
ancy is
b
ui
l
t into t
h
e enc
l
osure wit
h
optiona
l
d
ua
l
enc
l
osure
m
ana
g
ement modules
(
EMMs
)
and dual power supply–coolin
g
f
an
m
odules. With dual EMMs, control and monitoring of the enclosure
e
l
e
m
e
n
ts
co
n
t
in
ue
e
v
e
n i
f
o
n
e
EMM
fa
il
s.
Thi
s
a
ll
o
w
s
t
h
e
fu
n
ct
i
o
n
a
l
E
MM to manage t
h
e enc
l
osure—monitoring an
d
contro
ll
ing t
h
e
alarms, LEDs, power supplies, and
f
ans.
Each power supply–cooling
f
an module in the PowerVault
MD1000 contains an inte
g
rated power supply with two fans.
A
lthough the enclosure can sustain the loss o
f
one power supply,
three of the four fans must be functional to maintain proper cool-
in
g
. Durin
g
a hot replacement, coolin
g
is supported
f
or a maximum
of five minutes when only one power supply–cooling fan module
is present in the enclosure. The remainin
g
f
ans will speed up to
p
rovi
d
e t
h
e necessary coo
l
ing.
T
he PowerVault MD1000 provides stora
g
e provisionin
g
f
lex-
ibilit
y
. This is achieved b
y
two back
p
lane modes—uni
f
ied and
split—offered in the enclosure. Administrators can easily set the
f
b
ackplane mode by using the toggle switch located on the
f
ront o
f
the PowerVault MD1000 and power cyclin
g
the enclosure for the
chan
g
e to take e
ff
ect.
U
nifi
ed
m
ode
l
ets
ad
mini
st
r
ato
r
s
access
a
ll 1
5
h
a
r
d
d
i
s
k
drives
(
HDDs
)
f
rom a sin
g
le controller and provides the ability to
d
aisy-c
h
ain up to two a
dd
itiona
l
enc
l
osures. T
h
is a
ll
ows access
to a total o
f
45 HDDs with a maximum o
f
13.5 TB
(
45×300 GB,
g
iven the currently supported drive sizes
)
. Split mode lets two
controllers share the same enclosure in an ei
g
ht-to-seven HDD
split—that is, one controller has access to eight o
f
the HDDs,
w
h
i
le
a
n
othe
r
co
n
t
r
olle
r
has
access
to
the
othe
r
se
v
e
n HDD
s.
An
enclosure in split con
f
i
g
uration does not permit daisy-chainin
g
add
i
t
i
o
n
al
e
n
closu
r
es.
T
hese PowerVault MD1000
f
eatures are desi
g
ned to provide
cost-effective, scalable storage with SAS or SATA drives. Figure 2
p
rovides a
f
eatures comparison o
f
the PowerVault MD1000 stor-
age expansion enc
l
osure an
d
t
h
e previous-generation PowerVau
l
t
2
20S/221S SCSI disk stora
g
e enclosure
.
Figure 1. Comparison of SCSI and SAS technologie
s
SCSI SAS
Current performance capability 320 MB/sec 3 Gbps*
Projected performance capability 320 MB/sec 6 Gbps*
Cable length 12 meters 6 meters
Scalability 16 devices per bus 16,000-plus devices
per domain
Architecture Parallel bus Point to point
Device compatibility SCSI devices SAS and SATA devices
*SAS performance is for a 1X point-to-point connection.
Figure 2. Comparison of PowerVault 220S/221S and PowerVault MD1000 disk
e
nclosures
Feature PowerVault 220S/221S PowerVault MD1000
Rack height 3U 3U
Number of HDD bays Fourteen 3.5-inch drives Fifteen 3.5-inch drives
Manageability In-band SCSI In-band SCSI
Backplane options Joined or split bus Unified or split bus
Drive support Ultra160, Ultra320, Low Voltage SAS 3 Gbps; SATA II
Differential SCSI
SCSI and RAID cards PERC 2 PERC 5/E
PERC 3/Dual Channel (DC)
PERC 3/Dual Channel Light (DCL)
PERC 3/Quad Channel (QC)
PERC 4/Single Channel (SC)
PERC 4/DC
PERC 4/DC integrated (Di)
Adaptec 39160 host bus adapter
Cluster support Yes No
Expansion No Yes, daisy-chain up to three
enclosures per connection
Storage management Dell OpenManage Array Dell OpenManage Server
software Manager and Dell OpenManage Administrator
Server Administrator
Rack or stand-alone Both Rack only
tower
Drive hot-plug support Yes Yes
Hot-plug fans/blowers Yes Yes, via the power supply–
cooling fan module
Hot-plug power Yes Yes, via the power supply–
supplies cooling fan module
Enclosure management Redundant or nonredundant Redundant or nonredundant
configuration
Power supply Redundant or nonredundant Redundant
configuration
Fans/blowers Redundant Redundant
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